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Just my 2 cents about Quality of Life. It depends on :
- density of population -> build more housings
- number of hospitals and sport hall
- criminality
- the way you have build your city (they seem to like empty spaces)
- tech level
- tax level (do commerce and lower this rate !)

If never you tried your best unuccessfully with these few tips, here is the master stroke : just to put reproduction level (or whatever it's called) to null... People will then have hips of space, many hospitals, and so on. BTW the criminality will reduce.

Of course, you're better off doing so when the aliens have been wipped out !

I hope it might help someone ^^